All fellows are giving fruitful suggestions.... i want to add one more thing that in some articles and magazines some standard sentences are also given which should be copied in the paper(not the whole one). because every one cannot complete the whole essay paper in his own small sentences.so in my personal opinion we should maintain our register separately topic wise in which we write these lines which come from the material. in this way mistakes chances will be reduced

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Main ne Allah ko Apny irado ke tootany se pehchana":Hazrat Ali (RA)"